'Johnson County, IL' definitions:
Johnson -- U.S. County in Illinois
From: Gazetteer 2000
Name :
Johnson -- U.S. County in Illinois
Population (2000) :
12878
Housing Units (2000) :
5046
Land area (2000) :
344.627145 sq. miles (892.580171 sq. km)
Water area (2000) :
4.248901 sq. miles (11.004603 sq. km)
Total area (2000) :
348.876046 sq. miles (903.584774 sq. km)
Located within :
Illinois (IL), FIPS 17
Location :
37.466033 N, 88.894637 W